How to run GTA IV at 1080p on a PS3

The resolution of the PS3 version of GTA IV’s been something of a hot banana this week (there was more to it in the end: apparently it runs at 640p, not 630p, but we figured life was too short), but TalkPlayStation.com reckons it’s easy enough to make the game run at 1080p, assuming you have the right TV, obviously.